聚乳酸/聚酮共混纤维分散染料染色性能

Dyeing properties of polylactic acid/polyketone fibers with disperse dye

为了改善聚乳酸(PLA)纤维的染色性能,采用分散蓝79对聚乳酸/聚酮(PLA/PK)共混纤维染色,探究了染色温度、时间、pH值等因素对染色性能的影响,分析了染色动力学与热力学行为。研究得出分散蓝79对PLA/PK共混纤维染色的优化工艺:染色温度为110℃,染色时间为40 min,pH值为5。结果表明:纤维染色K/S值随PLA/PK共混纤维中PK含量的增加而略有提升,共混纤维染色的耐摩擦色牢度和耐皂洗色牢度保持在3级以上;与纯PLA纤维相比,分散蓝79染料在PLA/PK共混纤维(4%PK)上的平衡吸附量增大,半染时间缩短,扩散系数增大,具有比聚乳酸更好的染色性能;通过拟合计算发现分散蓝79染料对纯PLA纤维、PLA/PK共混纤维(4%PK)的吸附等温线为Nernst与Langmuir复合型曲线。

To improve dyeing performance of polylactic acid(PLA)fibers,Disperse Blue 79 was used to dye polylactic acid/polyketone(PLA/PK)blend fibers.The influence of dyeing temperature,time,pH value and other factors were investigated,with the dyeing kinetics and thermodynamic behavior analyzed.The optimal processing parameters were identified,which are dyeing temperature of 110℃,holding time of 40 min,and pH value of 5.With increased PK content,the K/S value of the blend fibers increases significantly and the color fastness to rubbing and soaping remains over level 3,the equilibrium adsorption amount of Disperse Blue 79 dye on the blend fiber increases,the half dyeing time decreases,and the diffusion coefficient increases,further confirming the improved dyeing properties of the blend fiber.The adsorption isotherms of Disperse Blue 79 dye to PLA fiber and blended fibers are calculated by fitting,showing a composite curve of Nernst and Langmuir.